Hydrodynamics of nonintegrable systems from a relaxation-time approximation

Javier Lopez-Piqueres, Brayden Ware, Sarang Gopalakrishnan, Romain Vasseur

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


We develop a general kinetic theory framework to describe the hydrodynamics of strongly interacting, nonequilibrium quantum systems in which integrability is weakly broken, leaving a few residual conserved quantities. This framework is based on a generalized relaxation-time approximation; it gives a simple, but surprisingly accurate, prescription for computing nonequilibrium transport even in strongly interacting systems. We validate the predictions of this approximation against matrix product operator calculations on chaotic quantum spin chains, finding surprisingly good agreement. We show that despite its simplicity, our framework can capture phenomena distinctive to strongly interacting systems, such as widely separated charge and energy diffusion constants.

Original languageEnglish (US)
Article numberL060302
JournalPhysical Review B
Issue number6
StatePublished - Feb 24 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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